180
Failure code
Outdoor
digital
display tube:
26-0, 1, 2
Indoor wired
controller:
1A
Indoor unit LED status
LED5
Failure description:
Communication between indoor unit and
outdoor unit failure
20 times
Outdoor unit LED status
LED1
LED2
Normal
Normal
1. Model
Failure diagnosis and troubleshooting
MRV 5-RC series
Diagnosis
Troubleshooting
2. Abnormity detection method
◆
Grounded short-circuit
of communication wire, or
disconnected communication
wire P and Q;
◆
Incorrect wiring of
communication wire P and Q;
◆
Uniform indoor unit power
supply, and partial indoor unit
being powered off.
◆
Larger interference and
unstable communication signal.
◆
Failure in PCB of indoor and
outdoor unit results in unstable
communication.
3. Abnormity confirmation
conditions
It is not detected that there
is indoor unit connection for
200 rounds continuously; it
is detected that the number
of indoor units is less than
set number for 270 seconds
continuously; it is detected that
the number of indoor units is
more than set number for 170
seconds continuously.
4. Possible causes
◆Poor communication wire:
short circuit and disconnection;
◆Incorrect wiring of
communication wire P and Q P
and Q;
◆Poor PCB results poor
communication;
◆Larger interference of normal
communication.
Replace it correctly by after-
sales personnel on site.
Check if the communication
wire of outdoor unit is shorted
Check if the communication wire
of outdoor unit is disconnected
Check if the communication
wire P and Q of indoor and
outdoor unit is incorrect
Check if there is same indoor unit No.
Replace indoor or outdoor computer board
Check if the computer board
communication port of indoor
and outdoor unit is correct
Check if there is interference source
Replace it correctly by after-
sales personnel on site.
Replace it correctly by after-
sales personnel on site.
Adjust it correctly by after-
sales personnel on site.
Adjust it correctly by after-
sales personnel on site.
Eliminate the interference
source.
Y
N
N
N
N
N
Y
Y
Y
Y
N
Y
Summary of Contents for MRV 5-RC AB052MAERA
Page 1: ...MRV 5 RC Service Manual SYJS 03 2019REV A Edition 2019 03 ...
Page 3: ......
Page 55: ...52 AV08 10 12 14IMVURA 4 Center of gravity x X 347 9587 y 471 5454 z 725 6683 y z ...
Page 56: ...53 AV16 18 20 22IMVURA x X 650 5962 y 380 7255 z 706 5342 y z ...
Page 106: ...103 2 Dimension 4 19 200 60 25 25 25 249 108 232 84 69 388 73 82 65 103 177 4 44 4 35 277 ...
Page 116: ...113 2 Preparation before installation ...
Page 162: ...159 One by one valve box PCB code 0151800186A 2 Valve box PCB photo and dip switch setting ...
Page 165: ...162 One by four valve box PCB code 0151800466 ...